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Old 2nd April 2009, 10:34 PM   #1
rknize is offline rknize  United States
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Default Morgan Jones 5842 RIAA

Has anyone built this thing (or anything like it)? It seems that I already have the bottles needed to build it with his favorite series heater scheme, but the design is complex compared to other RIAA stages out there.

Any thoughts?

Russ
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Old 3rd April 2009, 09:15 AM   #2
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IMHO there is a limit to the THD/noise of the average record. Other than the few really well recorded vinyl records available do you really need the UBERALLESRIAAPRE? A good 6DJ8 is all that is needed for 95% of all records available. Go with the 5842 for the ultimate RIAA Pre but it will be the last you ever need.
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Old 3rd April 2009, 02:54 PM   #3
rknize is offline rknize  United States
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Thanks. I get that feeling as well. The parts count is high due to his very thorough power filtering between each stage. He does also discuss a "practical" RIAA stage using 6DJ8s and CCS plate loads. I recently went through some of my tube stash and was reminded of his 5842 design. I am also considering an Aikido RIAA stage, since it involves a PCB and thus it is highly likely that I will actually finish it.

At some point I need to build something...

Russ
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Old 3rd April 2009, 10:29 PM   #4
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I agree the MJ RIAA is heavy on components. I'm putting together a version of the Phonodude RIAA stage as a try-out, this has very few parts and apparently sounds very good. Do a search on this forum.
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Old 3rd April 2009, 11:50 PM   #5
kevinkr is offline kevinkr  United States
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I use the D3A and 5842 in my current phono stage design, and all I can say is it is absolutely silent, and a phono stage can never really be too quiet. It was worth the trouble and sounds like it..
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Old 4th April 2009, 01:05 AM   #6
SY is offline SY  United States
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Quote:
a phono stage can never really be too quiet.
Couldn't agree more. What Morgan also paid close attention to (and I think is equally important) is overload recovery. Records have ticks and pops, cartridges have tip resonances, and their output is proportional to frequency.

The D3a is a superb tube for phono. And it also can swing a lot of volts cleanly.
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Old 4th April 2009, 02:59 AM   #7
rknize is offline rknize  United States
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Quote:
Originally posted by SY
Couldn't agree more. What Morgan also paid close attention to (and I think is equally important) is overload recovery. Records have ticks and pops, cartridges have tip resonances, and their output is proportional to frequency.

The D3a is a superb tube for phono. And it also can swing a lot of volts cleanly.
Yes, recovery is exactly why I want to build a tube phono stage. The SS one I have now is horrible in that way, especially with my new speakers. My LP collection is mainly stuff from my teenage years plus a bunch of other used stuff. They are not in pristine condition by any means. I have CDs for most of it, but some of the CD mastering is just crap.

So MJ's "practical" preamp has seemingly comparable power supply isolation between stages, as each has a separate CCS. Aikido is attractive due to its impressive PSRR.
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